diff --git a/libASL/transforms.ml b/libASL/transforms.ml
index 6ad4318..0c19759 100644
--- a/libASL/transforms.ml
+++ b/libASL/transforms.ml
@@ -1188,6 +1188,7 @@ module IntToBits = struct
         (match name_of_FIdent f with
         | "add_bits" -> ChangeDoChildrenPost (narrow_args (), fun x -> Expr_Slices (x, [sl]))
         | "sub_bits" -> ChangeDoChildrenPost (narrow_args (), fun x -> Expr_Slices (x, [sl]))
+        | "mul_bits" -> ChangeDoChildrenPost (narrow_args (), fun x -> Expr_Slices (x, [sl]))
         | _ -> ChangeDoChildrenPost (narrow inner, fun x -> Expr_Slices (x, [sl]))
         )
       | _ -> DoChildren